<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <Header :addTodo="addTodo"/>
        <List :todos="todos" :deleteTodo="deleteTodo"/>
        <Footer :todos="todos" v-if="todos.length" :checkAll="checkAll"/>
      </div>
    </div>
  </div>
</template>

<script>
	import Header from './components/Header.vue'
	import List from './components/List.vue'
	import Footer from './components/Footer.vue'

	export default {
		name: "App",
		components:{Header,List,Footer},
		data() {
			return {
				todos:[
					{id:'65wqref12',title:'吃饭',done:true},
					{id:'65wqref13',title:'睡觉',done:false},
					{id:'65wqref14',title:'学习',done:true},
					{id:'65wqref15',title:'打游戏',done:false}
				]
			}
		},
		methods: {
			// 用于向todos数组中添加一个todo对象
			addTodo(todo){
				this.todos.unshift(todo)
			},
			// 用于在todos数组中删除一个todo对象
			deleteTodo(id){
				//第一种方式
				/* this.todos = this.todos.filter((todo)=>{
					return todo.id !== id
				}) */

				// 第二种方式
				// 找到要删除项的索引值
				let index = this.todos.findIndex( todo => todo.id === id )
				// 操作数组
				this.todos.splice(index,1)
			},
			// 用于全选todos
			checkAll(done){
				this.todos.forEach((todo)=>{
					todo.done = done
				})
			}
		},
	};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>